# What is the Y in 480Y voltage?

The Wye (also know as Star - especially in the motor rewind industry) is a 4-wire system which provides two different supply voltages. The center-point of the Wye is the system neutral and is usually solidly grounded. Where it is desirable to limit the phase-to-ground fault magnitude the center-point of the Wye may be connected to ground through and neutral grounding resistor or a current limiting reactor. Because the system is tied to ground it is easy to provide system ground fault protection. Three-phase loads can be connected phase-to-phase and singlephase loads can be connected from any phase to the system neutral. On a wye system, the phase unbalance currentis carried by the system neutral. On a Wye system the line current is equal to the phase current i.e. ( ILine 1 = IPhase A) and the line-to-line voltage is equal to the vector sum of two individual phase voltages i.e. (E Line1-2 = E PhaseA + E PhaseB' ). In a Wye system the phase-to-phase voltage is 1.732 x the phase-to-ground voltage. Some typical Wye system voltages are: 120/208Y, 277/480Y, 2400/4160Y, 4160/7200Y, 7200/12470Y, 7620/13200Y,and 19920/34500Y

### What is a three phase transformer?

Three Phase transformers have three windings. If connected in Delta, it will have R Y B phase winding, voltage between RY, YB and BR. Phase voltage and line voltage are same. If connected in Star, there will be a neutral as well with RYB. Line voltage and Phase voltage are different. Line voltage = 1.73 x Phase voltage.

### How can you test the vector group DYn11 and vector diagram?

connect the neutral point of the star (secondary) to u phase of primary, and now apply voltage to primary and measure the voltage between V&R, W&B, V&Y and V&B. when you measure voltage b/w 1. V&R the voltage must be maximum, 2. W&B Should be minimum and 3. voltage between V&Y and V&B should be same U.V&W are primary (Delta) R,Y&B are secondary (Star)

### What is the difference between line voltage and phase voltage?

Line voltages are measured between any pair of line conductors, whereas phase voltages are measured across any individual phase. For a three-phase, three-wire, system, the line voltage is numerically equal to the phase voltage, and both are measured between any pair of line conductors. For a three-phase, four-wire, system, the line voltage is 1.732 times the phase voltage, with the line voltage measured between any pair of line conductors, and the phase voltage measured between…

### Difference between ideal zener diode and practical zener diode?

An ideal zener diode will have zero reverse current while the reverse voltage is less than the zener voltage. Once the voltage rises above the zener voltage, the maximum reverse current will become infinite (the device will become a short). On a graph with voltage along the X axis and current along the Y axis, this would be represented by a straight vertical line crossing through the zener voltage. A practical zener diode has a…

### Where are Vpp and V rms?

Vpp is Peak-to-Peak voltage, in other words, in AC voltage, the peak-to-peak voltage is the potential difference between the lowest trough in the AC signal to the highest. Assuming the reference to the voltage is zero, Vpp would be twice the peak voltage (between zero and either the highest or lowest point in the AC waveform). Vrms is the Root Mean Square voltage, think of it as sort of an average (it's not quite that…

### How do you determine angle between primary line voltage and secondary line voltage of a 3-phase transformer?

You should look at the transformer vector diagram, or the type of transformer will tell you (something like YnD1, for example). If it's a Y/Y type transformer, the phase angle will be zero. If it is a D/D, it will be zero. If it's a Y/D, or D/Y, it could be +30, -30 (usually). I have seen a few strange cases where a Y/D was +150 degrees.

### What will happen if dc voltage is applied to anop amp integrator circuit?

Just consider the a DC voltage as the function y = (DC value), lets call the DC value 1 volt. Then the integral of y=1 is y=x. The op amp will create a ramp that is representative of y=x until it saturates. Depending on the op amp, it will most likely saturate somewhere around Vcc - 2V. As soon as it hits this rail it will level off.

### What is the difference between voltage forward voltage and voltage drop?

Voltage is the potential difference between the source & any point in the circuit. The forward voltage is the voltage drop across the diode if the voltage at the anode is more positive than the voltage at the cathode (if you connect + to the anode). Voltage drop means, amount of voltage by which voltage across load resistor is less then the source voltage.

### Why the voltage applied to each winding in a STAR configuration of three phase is reduced?

In a star configuration, often called "Y", the voltage across one winding is from a phase to ground. Phase to phase you have voltage across 2 windings. And at the risk of confusing you, the phase to phase voltage is not double the other because the windings are only 120 degrees out of phase and not 180 degrees. To calculate this you take the voltage of one winding, 120v for example, and multiply by the…

### What are voltage stabilizers?

Voltage Stabilizer is also called Automatic Voltage Stabilizer or AC Voltage Stabilizer or Voltage Regulator. Actually an automatic voltage stabilizer is designed to automatically maintain a constant voltage level, with protections of equipment against voltage surges, over voltage, under voltage, smoothing impulsive noise.

### What is three phase and single phase?

Three phase system has three cables indicated by R Y and B phase. Typical voltage be 440 volts between the phases. This voltage level depends on the region. Many different countries have adopted different voltage levels. Single phase means two wires - one phase and a neutral. Phase to neutral voltage would be 230 volts. Again this value depends the region or country.

### How does an AVR adjust the voltage automaticall y?

The AVR controls the voltage applied to the rotor. If this voltage is low, power flow in the rotor will be low, resulting in the rotor acting like a weak electromagnet. The weaker the electromagnet, the less power it can be used to push out of the generator (think of this like gears on a bicycle), and the lower the output voltage will be. If the AVR increases the voltage, the electromagnet becomes stronger, increasing…

### Is voltage drop means lost of voltage?

Voltage drop means reduction of voltage. Additional Answer According to Kirchhoff's Voltage Law, the sum of the voltage drops around any closed loop within a circuit must equal the value of the supply voltage. So, no, a voltage drop is not a 'lost' voltage, as the circuit's supply voltage is accounted for when you add up all the voltage drops (including any internal voltage drop within the source itself).

### What is the conversion from RMS voltage to peak voltage?

The average voltage is the rms voltage. Volts peak = volts RMS times 1.414 Volts RMS = volts peak times 0.7071 Use the link below to an RMS voltage, peak voltage and peak-to-peak voltage calculator. ******************************** The average voltage is not the r.m.s. voltage. The average voltage of a sine wave is 0.636 x the peak value. Conversely, peak voltage is 1.57 the mean or average.

### Voltage regulation of transformer?

Transformers don't do voltage regulation they do voltage conversion. So you need something else to do the regulation because it can only multiply an (AC) voltage by some predetermined constant. So if they input voltage is not stable, then neither will the output. Answer A transformer's voltage regulation is defined as 'the variation of secondary voltage, from no-load to full-load, expressed either as a per-unit or percentage of its no-load voltage'. In other words: voltage…

### How much current does a flashlight use is it's batteries supply 4.5 volts and it's bulb has a resistance of 9 ohms?

Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance. Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance. Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance. Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.